Study on Unscheduled Direct Maintenance Cost of Civil Aircraft Structure

Abstract

To solve the problem of the unscheduled direct maintenance cost of civil aircraft structure is difficult to predict in the design phase. The elements and influence factors of DMC are introduced, and the prediction flow, model and adjustment model are established. Based on engineering design inputs and statistical reports, an example about a skin panel of forward-mid fuselage is presented. A series of DMC values of the maintenance tasks from MSG-3, DTA and DSEA analysis are computed, and the various DMC prediction results for metal and composite skin panel are compared and analyzed. The feasibility of the prediction method is verified, and the accuracy of the prediction model is reflected. It is shown that environment damage(ED) and fatigue damage(FD) are the main factors affecting the DMC of the metal structure, and the application of composite materials can significantly reduce the unscheduled DMC.

Keywords

• civil aircraft
• dmc
• prediction model
• ed
• fd
• special event
• unscheduled maintenance